count - SQL SERVER 计算 ID 的值

Question

我正在尝试计算每个 C.ID 的 B.ID。

到目前为止，我得到以下信息：

Select
C.ID,
COUNT(Distinct B.ID)AS 'Total bookings'

FROM Client C

inner join Booking B on B.ClientID=C.ID

Where ClientID = '594861'

Group by C.ID

Answer 1

问题出在我的 Group by 身上！

Select
C.ID,
COUNT(Distinct B.ID)AS 'Total bookings'

FROM Client C

inner join Booking B on B.ClientID=C.ID

Where ClientID = '594861'

Group by C.ID